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(No Model.) 2 Sheets-Sheet 1.

- T. R. TIMBY.

REVOLVINGTOWER SYSTEM OF PORTIFIGATIONS. No. 330,688. Patented Nov. 17,1885.

N. PETERS. Phnm-umn m. Walhlnglon. l1 c4 No Model.) 2 Sheets-Sheet 2. T;R. TIMBY.

REVOLVING TOWER SYSTEM OF FORTIFIGATIONS.

No. 330,638. Patented Nov. 17, 1885.

N. PETERS, PhuwLilhognplmr, Waahinglon. D. C.

NITE

' ATENT Fries.

THEODORE R. TIMBY, OE NYAOK, NEW YORK.

SPECIFICATION forming part of Letters Patent No. 330,638, dated November17, 1885.

Application filed April 21, 1885.

To all whom it may concern:

Be it known that I, THEODORE R. TIMBY, a. citizen of the United States,residing at Nyack, in the county of Rockland and State of 1 New York,have invented anew and useful Improvement in Revolving-Tower Systems ofFortifications, of which the following is a specification.

In my system of revolving battery-towers the revolving tower isconstructed with a dome within which the officer is seated on aplatform, which he turns at his pleasure on a .verticalaxis, while thetower carrying the guns revolves independently around it. Thesighting-platform on which the officer sits controls the electricalfiring mechanism, as I have fully described in Letters Patent No.312,231, granted to me the th day of February, 1885, and also asightingtelescope, which is mounted accurately in the vertical plane ofthe firingline, the sight being taken through horizontal loop-holesextending around the dome, and very narrow vertically.

The subject of my present invention is the combination, with such arevolving batterytower, of a sight, preferably telescopic, pivoted verynear the loop-hole in the dome-wall,

. through which the sight is taken, and adj ustable vertically at theeye or inner end, for the purpose of sighting an object near by or faroff on the horizon through a very narrow opening.

In the accompanying drawings, Figure I is a vertical section of arevolving battery-tower with my invention applied. Fig. II is a verticalsection,on a larger scale, of the dome and sighting mechanism.

The revolving tower is constructed with external walls, 1, of thenecessary strength to resist an enemys fire, surmounted bya dome, 2,within which the officer sits, and with a cylindrical well, 3,concentric with the revolving tower and turning therewith. The internalconstruction of the tower and its support ing and revolving mechanism,and the electrical firing apparatus 30 31 32 33, may be as described inmy Patent No. 312,231, above referred to. In the center of the tower,within the well 3, is a vertical shaft, 16, running in a step, 17, and abearing, 18, which form part of the stationary foundation 15 of thetower. The vertical shaft 16 carries at its upper end a platform, 19,surrounded by a curb, 20, and forming an upper bearing for a secondvertical shaft, 21,-parallel with the shaft 16, and

Serial No. 162,939. (No model.)

having its lower bearing in a horizontal arm, 22, projecting fromthesaid shaft 16. On the lower end of the shaft 21 is a pinion, 23,gearing with a cogged rim, 24:, fixed to the base or foundation withinthe central well, 3, of the tower, so that by the rotation of the shaft21 the shaft 16, and with it the platform 19, will be revolved. Thisrotation of the shaft 21 is effected by the hand-wheel 25 andWorm-and-pinion gearing 26, or by any other suitable mechanicalconnection. The platform also carries a sighting-telescope, 27 pivotedat its object end by a hinge or joint, 28, in close proximity to theinner surface of the wall of the dome on a level with the horizontalrange of loop-holes 29 therein, so that I am enabled to sight an objectclose by or far off on the horizon through a very narrow opening, thedistance of the object being indicated by the elevation or verticalangle of the telescope. To effect the vertical adjustment of thetelescope, as indicated by dotted lines in Fig. II, its sight'end issupported by a link, 40, from a screw standard, 41, threaded within aswiveled sleeve, 42, in the axis of the tower and platform, said sleevebeing provided at its upper end with handspokes 43, by which it isturned in either direction to raise or lower the said end of thetelescope.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

1. The combination, with a revolving battery-tower, of asighting-platform revolving concentrically and independently therein,and a sight carried by said platform hinged or pivoted at its outer endin close proximity to the tower wall or dome and capable of elevationand depression at its inner end for the purpose of sighting an objectnear by or far off through a vertically-narrow opening, as explained.

2. The combination,-with a revolving battery-tower, of a platform, 19,mounted concentrically therein and capable of independent movement,rotating mechanism 25 26, telescope 27, pivoted close to the opening inthe wall, and elevating mechanism 41 of said telescope, as and for thepurpose set forth.

THEODORE R. TIMBY.

Witnesses:

OO'IAVIUS KNIGHT, HARRY E. KNIGHT.

